package neu.soft.websocket;

import lombok.extern.slf4j.Slf4j;
import neu.soft.config.ServerEncoder;
import neu.soft.vo.MsgBean;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint(value = "/websocket/{eName}",encoders = {ServerEncoder.class})
@Component
@Slf4j
public class WebSocketServer {
    //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static int onlineCount = 0;
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
    private static CopyOnWriteArraySet<String> userName = new CopyOnWriteArraySet<>();
    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;

    //接收sid
    private String eName = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("eName") String eName) {
        this.session = session;
        if (!userName.contains(eName)){
            webSocketSet.add(this);     //加入set中
            addOnlineCount();           //在线数加1
            this.eName = eName;
        }
        log.info("有新窗口开始监听:" + eName + ",当前在线人数为" + getOnlineCount());

    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //从set中删除
        subOnlineCount();           //在线数减1
        log.info("有一连接关闭！当前在线人数为" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("收到来自窗口" + eName + "的信息:" + message);
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(new MsgBean<>(message,message));

            } catch (IOException | EncodeException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(MsgBean message) throws IOException, EncodeException {
        this.session.getBasicRemote().sendObject(message);
    }

    /**
     * 群发自定义消息
     */
    public static void sendInfo(MsgBean message, @PathParam("eName") String eName) throws IOException {
        log.info("推送消息到窗口" + eName + "，推送内容:" + message.getMsg());
        for (WebSocketServer item : webSocketSet) {
            try {
                //这里可以设定只推送给这个eName的，为null则全部推送
                if (eName == null) {
                    item.sendMessage(message);
                } else if (item.eName.equals(eName)) {
                    item.sendMessage(message);
                }
            } catch (IOException | EncodeException e) {
                continue;
            }
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }

    public static CopyOnWriteArraySet<WebSocketServer> getWebSocketSet() {
        return webSocketSet;
    }
}